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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e602a88a970e2383ede8a98fa98e893046feaa7e3987fcb0807c272c2877a5' 
  AND token = '4P3+XXXmjQV32X1x8tcXOQRU3Fco9nLUhMjk/0724BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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