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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93b14c846d73e1d5e71b3a2c4139e3a240b9a46e0b1ae2c38de5dac0baa315c' 
  AND token = 'EgXK1Ky/T6fwEQS3unC6TanzmjYK5mVqPLcZVighg7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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