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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8c9e1870c319a0997521ce87c2fd89b7b85b7dd6717fdbdd8a88358f266d30' 
  AND token = 'h1NUVsASvLKrI6m71AmYnoQlaSxlKejxe9mefG9FZNU=' 
  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"
    }
  }
}