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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759dee5abb1b478de74f353ace37569d02e9c954c20e60eec15b5dea0e078123' 
  AND token = 'yDV4AX74lnGummjdRN42+Eg+XJFvOrdH4WxNkVs5F7E=' 
  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"
    }
  }
}