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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed8ca95bd6e6a2b5913542d8d88a9807bae274925756d28329d47efa475df48' 
  AND token = 'dn6x5es49kdS6vcE5ErWPaM6qLy4MmxRmlBMPkcGW7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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