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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8f53e4a90cfbc93c6f403ad20632419c24bb5a23cf41650b42bdc8071d8fa9' 
  AND token = 'uCVZ8F9HeEyUkLmPH6FaVEcsMGyPqthuASu6LWQna3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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