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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82db2e018513939a163f1cc06d18d11313e38a4b5cffd30c34fa6c3e5346ce7a' 
  AND token = 'mj8cFNvZMCZdMWzuffzrR7ZzSUiFvsso2JHNVdiTkMo=' 
  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"
    }
  }
}