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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de33f9cd85581d16405f416e1f97457e58f87222106de5fdf6c0377ae3f311df' 
  AND token = 'O90DwYFFnJaINysEMeQ8IlVQKGwXsUx8nQmBYPgeal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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