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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b119242dd012376a2ee59664f6f3e62eca607679403e91bfb7564ac4e6a013' 
  AND token = 'hWTRO1saBkMcRvC4XcM8Lqh/NS6QfqwShKXVydl9kOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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