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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57adcf7165c51d279a54ef245effa7d359b100c8c6cb86f695481cd5686b04b' 
  AND token = 'yNvCx33kpIYoR4XkJjJZqS881bD4hDq9x6qMfAdqBvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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