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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4f337dca7d311c8c11bb337ee1548bf69cd8445cd2374f18050581a3f0be20' 
  AND token = 'Qnsu+3qw0pHOHLEOqV65dD+cnqs1KQBKY4n/YVGB3c8=' 
  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"
    }
  }
}