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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eed07a3845b243b304afb0af59b759941bf82fc9234b1d7c8b1dad43f833174' 
  AND token = 'Dqzsj+lzNsrCR/Uez1UUca+OsgdmHOsTn+fnvOTG+38=' 
  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"
    }
  }
}