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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21bfa7e4d4bb90fd45b9e4afa454732311904c5c8138fd20e0e84e69fd17a1b9' 
  AND token = 'dC2PxhH3d0ZPWiJS6bg/KpsuMfW8gFOQfbhxtE3i6cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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