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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57c2ac3ddda2c2adbfeee40c05181c9b0b97b7c470cffc48ac3a53b90feaf25' 
  AND token = 'Wo4PHs7jcEwSzwvBwEZ/X+7KES1LpgV4XrErgkwGF7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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