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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792114c5bea3f57ab815631108dad1a11ee43a62a64763e6e4d6202f6666f94b' 
  AND token = 'q2KnOq3GLkC8CYzU8HS61DgrrcvvNKKLpD/3xGryCrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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