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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b42186826b1bd48dd97e1fc035fc77182140e29c3afa5cd1825d0adc70b5cf1' 
  AND token = 'tQ+m5zAmdSZgaJrWKw7PLiYRCw7CO1dd87xgHm6aSJw=' 
  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"
    }
  }
}