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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cdc820fe011deb4eecbe1301e76045f4c39d9e65b4f6e88491174d05c98280' 
  AND token = 'XIJMbNptcE8SOixlgAoJ1eVA1GaNsrWd5/dR4Yuk2Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}