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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27654b5a68aceb0c46759f9d1e9540c9858cd1c04fd4dd3fca10682a062b66ee' 
  AND token = 'Qv1vnjPfsEtF1q60Lp9DZfexItI7BKhP6L1U+UusNqc=' 
  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"
    }
  }
}