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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1870aefb10ed47fa7c2930cc132a5f04f1233a2989ccc66dad3b22d7f873b83d' 
  AND token = 'MWW1ZrXmdcsakjDkoSnAEKeNFL1/KYIe6vk3Z/V2Tow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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