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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074c7f2b5e17201752b3782c59dc870c392393d32498b81fcd39cc2dc0fb3260' 
  AND token = 'a3LMXXMU41gFzZrNbewOGewMgDj1NFjhFjnN3TMJ5Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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