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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a6e50620a692a2c2107635d14696f4e01d646950bd2b90faf3b96c2866522d' 
  AND token = '6Mpi/QDq1KqXNkDGh1pGu6Gnhp+sBLp+3E3ZO9b7Nao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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