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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3904314bfeca7ea67a24178e7a98093d8d3f95f3e5185179c6abd6fa98fd4584' 
  AND token = 'm5t0Pdy4IpLYfGeGuc/FJYQ7ss564A7gt9LvopkeRz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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