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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51c3a179e04cbc49d31b90ab2f3407f345980df0cd443aa14817a6f1a38fe17' 
  AND token = '54DK/iWNtuO1DYHvMFehJ4wCY1YiqZzDauc+s4UmSQM=' 
  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"
    }
  }
}