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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b37cafaa85bd0983afa907ad9f3b74d91cd34e516cbbef01c01dd1d8bc4112e' 
  AND token = 'ivONGi8+G+356jO6fRwIEE7iA0g4xiixxs1XTVgAiaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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