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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060cf42ab67e2d3b8b20e30b5e35782956e0dcb061a5f2b68cbd408f9163377b' 
  AND token = 'WdyXWnlD/bpMBR6x5AKqY7wZOTwwY0xucYOjz70Dexs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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