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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3500c63b0936c408321188bf0c35157a08ebe42ea22ddb350ec5dc8e52c21a5a' 
  AND token = 'ULTCkDL1HeySH7UPQ83u1991i0TUp9OjXBhdTuu7wbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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