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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a956f4763b164b566f30e37fd9b54a8c4500d667231d112c2cf5a932923d4f' 
  AND token = 'Yk9n+a09i/bL15rYrt7CmFOJ62xXz6yRmHGQP8pCFnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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