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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ab5a828efe12ce658b9801f6fa56e4e959927ece28850180d0843414fd7df1' 
  AND token = 'jEp3R6SOO3F3G1+Gbc0gw+Z6GoddJ+xsTIZ7bwzCTJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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