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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78e6cd94b18246013fae6580fddb8461ed50c7221e0cdf5e128b3e7bd62c00b' 
  AND token = 'HTZfUezhVSAA0PD/Wnjn7QHfB556U3xdzC6hLIKaYNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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