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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709ededc6eb0919f64d8c223b6bfe345d52c8fc3b6a583b022775418712225b2' 
  AND token = 'OMhhdpNBUSz2Hq331TQsW6/EhnxCv6E5KVPs9NtER4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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