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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8809b134a41778c2cf3bb03275b84179513330b8a967c202b966e5e22a2f3373' 
  AND token = 'RnTk3K+8c3HCMZCJbPlhm2pmqMEK+KL0Y1h91pjIpu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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