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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f418eeca05ea98824aa6d08e6a7e6700b814da23f307da85c0d1b3ebef0788b' 
  AND token = 'JCR4The2gd3+83/Wb47hZ4Us31sYYwsGFM2qVbak5u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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