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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7330b7caccbae0a1d1ea12a1dd4becae4ca6d9d38c74fe6d447ff7cffa9be8' 
  AND token = 'FgUZD5fDAs88gjVLuSb1h/jM0x9HNsOqS93qcltZjPU=' 
  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"
    }
  }
}