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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3634561dda7f0392c2e151a57971d4cc7ca953ed522733585e7db34c00c45512' 
  AND token = 'EU6X2Rcvr13D4VsL8aDmBR/7qA3cDSoyuPO7G6sPDWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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