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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207ac4deffab9216d30f4e47d792fdfd83beb21bacdf557475ac2b0177bc8ffd' 
  AND token = '4F97ZEHOIqivS05i1lWmb3jVB2SHLQHqPLPsexbKDrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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