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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f48ba063e311f763a785ee1939a92e9b15b989720a10ea138bdf38a0a7384a' 
  AND token = 'PMhTN2P9HAb79DyTQ8lfJ7hC70UdRnj3gyZK8Ee0kTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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