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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c46f6f2040ad97b5ad1779f52bc3b4745a54a3e6a87ede2c335a6bc746339e' 
  AND token = 'y8WbfVye5RA6x5yns/KHVzJm0v4Cpei+nDAvvEQelR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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