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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77ee39482519fa92ce5670a137d9ef52e3db5edccefe4f87745d5ac8c4390d5' 
  AND token = '+VksocR035yYTcrJ1r73dZLWSXW4iZH0Y0aIEsQ7ilg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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