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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e167574d1f9f4ed2a84d0c850b29045a30527c1c82df9b25ade0ea545533ee63' 
  AND token = '9zVgNAbQ252QiuniXBpYQb5jt2hDLllzrVLlb0TTvb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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