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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bc153b795e9a5ecd4c2aece82157d2899e1e9f4bfe273c73c5fa9a8fa2a157' 
  AND token = '+iX8HrjUvxizGQ06OVxzV41sbCxqZ4Cw21UUdLGpSDc=' 
  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"
    }
  }
}