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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a93f9d0c658dd4379cbf399d3ab3afa144ba99b529c2569b51e93a23c2ded9' 
  AND token = 'HjZmNMjjIdlsTGeP/5zHw2w6DmkKcqhHaBeK1meiLO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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