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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0008bc5c0fec59e134c1f5a90e7ded6f25b16c4d698f4287006de9fe83b82f88' 
  AND token = 'E+aDqibjRNvXHT9OQWOkPCu4Il/5WCYe3DMq0RD0Y+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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