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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14b34f591879cb50e0dd5148f5a10e53663e737f783b103cd93862a019c98a1' 
  AND token = 'LEaB2eivW0/eMWCYEacGHh1x8SAk0Q2fLO8uALA7bFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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