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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd6a26a67b8f31d7bef3aaa59a2777fd0a569d8cde580c8d3d090c16e62b849' 
  AND token = 'RAaU6yh+Ty5DgD0o2yU2ZSZ1BE/0RWB/eKY5pVdh4xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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