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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b2159249f145551f40f6158a1bdb8421f03d75a7734df82d79d598532c8e80' 
  AND token = 'otRi77n6vrYGxJN5j2gPmknQD/VryAMxWwlTcwqod2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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